/*
 * Copyright 2017 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.util.concurrent;

import io.netty.util.internal.ObjectUtil;

/**
 * 使用 {@link FastThreadLocal} 的 {@link Runnable}
 */
final class FastThreadLocalRunnable implements Runnable {

    private final Runnable runnable;

    private FastThreadLocalRunnable(Runnable runnable) {
        this.runnable = ObjectUtil.checkNotNull(runnable, "runnable");
    }

    static Runnable wrap(Runnable runnable) {
        return runnable instanceof FastThreadLocalRunnable ? runnable : new FastThreadLocalRunnable(runnable);
    }

    @Override
    public void run() {
        try {
            runnable.run();
        } finally {
            // 此处清除
            FastThreadLocal.removeAll();
        }
    }
}
